| | waec chemistry practical question & answer 2012. |  |
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+4Izuucelestine Precious4luv sanya blessingsmart 8 posters |
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blessingsmart
Novice
Sex : male
Posts : 5
Location : Lagos
| | Subject: waec chemistry practical question & answer 2012. 2012-04-03, 22:50 | |
| > QUANTITATIVE ANALYSIS <
TEST
Solution C + aqueous NaOH + Heat
-----------------------
Portion of Solution C + BaCl2 + dil. HCl.
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Portion of Solution D + NaOH in drops. Then in excess.
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Portion of Solutio D + NH3(aq) in drop then iq excess.
--------
Portion of Solution D + HNO3 + AgNO3 solution.
---------
Mixture frm above + HNO3 in excess.
------
OBSERVATIONS
Evolution of colourless gas with characteristics choking smell which turns moist red litmus paper blue and form white foam with conc. HClacid vapour.
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white ppt insoluble in dilute HCl
--------
Reddish brown ppt insoluble
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Reddish brown ppt insoluble
--------
White ppt insoluble
--------
White ppt dissolved to give a colourless solution.
-----------------
INFERENCE
NH3 gas from NH4+ is present.
-------
SO42-, SO32-, CO32- are present
--------
Fe3+ is present
-------
Fe3+ is present
--------
Cl- ion is present
------
Cl- ion is confirmed.
(N.B u write a test scroll to its observation and then its inference. 'cos itis to be written in tabular form i.e make a 3columns: then write
TEST| OBSERVATION|INFERENCE.) ,
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sanya
Amateur
Sex : male
Posts : 116
Location : ondo
| | Subject: Re: waec chemistry practical question & answer 2012. 2012-04-03, 23:32 | |
| Pls,were is question and answers..pls arrange it | |
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Precious4luv
Senior
Posts : 837
Location : HOME OF HOSPITALITY
| | Subject: Re: waec chemistry practical question & answer 2012. 2012-04-04, 00:39 | |
| good work, but what abt d VOLUMETRIC ANALYSIS. and how sure is this. Can we see d questions. | |
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Izuucelestine
Novice
Posts : 19
Location : Anambra state
| | Subject: waec questions 2012-04-04, 07:09 | |
| pls i need waec practical questions:mali pls | |
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mali
Amateur
Posts : 499
Location : Warri, Delta state
| | Subject: Re: waec chemistry practical question & answer 2012. 2012-04-04, 08:15 | |
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Aboderin Opeyemi
Novice
Posts : 18
| | Subject: Re: waec chemistry practical question & answer 2012. 2012-04-04, 13:47 | |
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Dannyoung
Novice
Sex : Male
Posts : 1
Location : At IFO IN OGUN STATE
| | Subject: Re: waec chemistry practical question & answer 2012. 2012-04-04, 17:40 | |
| Ples i need biology obj an essay | |
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blessingsmart
Novice
Sex : male
Posts : 5
Location : Lagos
| | Subject: Re: waec chemistry practical question & answer 2012. 2012-04-07, 16:46 | |
| The true biology specimen is available and question and answer. | |
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Chocboi4real
Novice
Sex : Male
Posts : 2
Location : zaria
| | Subject: Re: waec chemistry practical question & answer 2012. 2012-04-13, 08:24 | |
| - blessingsmart wrote:
- > QUANTITATIVE ANALYSIS <
TEST
Solution C + aqueous NaOH + Heat
-----------------------
Portion of Solution C + BaCl2 + dil. HCl.
-------------
Portion of Solution D + NaOH in drops. Then in excess.
----------
Portion of Solutio D + NH3(aq) in drop then iq excess.
--------
Portion of Solution D + HNO3 + AgNO3 solution.
---------
Mixture frm above + HNO3 in excess.
------
OBSERVATIONS
Evolution of colourless gas with characteristics choking smell which turns moist red litmus paper blue and form white foam with conc. HClacid vapour.
-----------------
white ppt insoluble in dilute HCl
--------
Reddish brown ppt insoluble
----------
Reddish brown ppt insoluble
--------
White ppt insoluble
--------
White ppt dissolved to give a colourless solution.
-----------------
INFERENCE
NH3 gas from NH4+ is present.
-------
SO42-, SO32-, CO32- are present
--------
Fe3+ is present
-------
Fe3+ is present
--------
Cl- ion is present
------
Cl- ion is confirmed.
(N.B u write a test scroll to its observation and then its inference. 'cos itis to be written in tabular form i.e make a 3columns: then write
TEST| OBSERVATION|INFERENCE.) ,
==================== | |
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